EP1169558B1 - Exhaust and intake rocker arm assemblies for modifying valve lift and timing during positive power - Google Patents
Exhaust and intake rocker arm assemblies for modifying valve lift and timing during positive power Download PDFInfo
- Publication number
- EP1169558B1 EP1169558B1 EP00920242A EP00920242A EP1169558B1 EP 1169558 B1 EP1169558 B1 EP 1169558B1 EP 00920242 A EP00920242 A EP 00920242A EP 00920242 A EP00920242 A EP 00920242A EP 1169558 B1 EP1169558 B1 EP 1169558B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rocker arm
- valve
- engine
- operating condition
- assembly
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0203—Variable control of intake and exhaust valves
- F02D13/0207—Variable control of intake and exhaust valves changing valve lift or valve lift and timing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
- F01L13/065—Compression release engine retarders of the "Jacobs Manufacturing" type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0273—Multiple actuations of a valve within an engine cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/04—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation using engine as brake
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/01—Internal exhaust gas recirculation, i.e. wherein the residual exhaust gases are trapped in the cylinder or pushed back from the intake or the exhaust manifold into the combustion chamber without the use of additional passages
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/08—Shape of cams
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L2013/0089—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque with means for delaying valve closing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2305/00—Valve arrangements comprising rollers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2800/00—Methods of operation using a variable valve timing mechanism
- F01L2800/10—Providing exhaust gas recirculation [EGR]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0242—Variable control of the exhaust valves only
- F02D13/0249—Variable control of the exhaust valves only changing the valve timing only
Definitions
- the present invention relates to an apparatus for operating at least one engine valve in an engine cylinder according to the preamble of claim 1.
- EP 0 520 801 discloses a variable valve actuation control system.
- a pair of intake valves is operated through rocker arms and cam lobes.
- two rocker arms may be connected to a third rocker arm which is operated through a cam lobe.
- pistons are provided within the rocker arms. By applying pressure through an opening in the rocker shaft and a channel in a rocker arm, the pistons can be moved.
- US 5,809,952 describes a method for modifying an engine valve event. Fluid is supplied to a rocker arm which is pivotally mounted on a rocker shaft. The rotation of the rocker arm relative to the rocker shaft is varied.
- an exhaust event with an internal hot exhaust gas recirculation (“EGR") event is beneficial in controlling emissions by directing a small amount of the exhaust gas back into the valve cylinder to mix with intake air.
- the combined intake and exhaust gas with the depleted oxygen helps create a lower burn temperature, which helps reduce the generation of nitrogen oxides.
- certain positive power conditions including which the EGR event does not add any benefit. These conditions include a light load and low engine rpm.
- the EGR event also does not provide any benefit during engine braking where the EGR event reduces braking power. Therefore, it is desirable to have the EGR event to be selectable, on as desired during positive power and off during braking.
- FIG. 2 illustrates a top view of the present invention in an overhead cam diesel engine.
- An intake rocker arm 30, an exhaust rocker arm 40 and a braking rocker arm 20 are pivotably mounted on and spaced along a rocker shaft 50.
- the intake rocker arm 30 is adapted to engage an intake valve crosshead 300 for at least one intake valve to operate the at least one intake valve.
- the exhaust rocker arm 40 is adapted to engage an exhaust valve crosshead 400 for at least one exhaust valve to operate the at least one exhaust valve during predetermined operating conditions.
- the braking rocker arm 20 is also adapted to engage the crosshead 400 to operate the at least one exhaust valve during an engine braking operation.
- the rocker arms 20, 30 and 40 are spaced along a common rocker shaft 50 having at least two passages formed therein.
- the rocker shaft 50 has a passage 51 through which a supply of controlled engine oil or other suitable hydraulic fluid flows therethrough to exhaust rocker arm 40 on demand.
- a valve assembly 510 controls the flow of engine oil to the exhaust rocker arm 40.
- the valve assembly 510 is preferably a solenoid valve. It, however, is contemplated by the inventors of the present invention that other suitable valves may be substituted and are considered to be within the scope of the present invention.
- the valve assembly 510 may be located on one of the rocker shaft 50, the engine or the exhaust rocker arm 40.
- the rocker shaft 50 has a passage 52 through which a supply of controlled engine oil or other suitable hydraulic fluid flows therethrough to the intake rocker arm 30.
- a valve assembly 520 controls the flow of engine oil to the intake rocker arm 30.
- the valve assembly 520 is preferably a solenoid valve. It, however, is contemplated by the inventors of the present invention that other suitable valves may be substituted and are considered to be within the scope of the present invention.
- the valve assembly 520 may be located on one of the rocker shaft 50, the engine or the intake rocker arm 30.
- the rocker shaft 50 has a passage 53 through which a supply of controlled engine oil or other suitable hydraulic fluid flows therethrough to braking rocker arm 20 on demand.
- a valve assembly 530 controls the flow of engine oil to the braking rocker arm 20.
- the valve assembly 530 is preferably a solenoid valve. It, however, is contemplated by the inventors of the present invention that other suitable valves may be substituted and are considered to be within the scope of the present invention.
- the valve assembly 530 may be located on one of the rocker shaft 50, the engine or the braking rocker arm 20.
- the rocker shaft 50 has a passage 54 through which a supply of engine oil or other suitable hydraulic fluid flows therethrough to lubricate the rocker arms 20, 30 and 40 to enable smooth pivotable movement of the rocker arms 20, 30 and 40 about common rocker shaft 50.
- the rocker arms 20, 30 and 40 correspond to a cam shaft 10 having three spaced cam lobes 12, 13, and 14.
- Exhaust cam lobe 14 corresponds to the exhaust rocker arm 40.
- An EGR bump 11 also corresponds to the exhaust rocker arm 40.
- Intake cam lobe 13 corresponds to an intake rocker arm 30.
- Brake cam lobe 12 corresponds to a brake rocker arm 20.
- the exhaust rocker arm 40 is rotatably mounted on the common rocker shaft 50.
- a first end of the exhaust rocker arm 40 includes an exhaust cam lobe follower 41.
- the exhaust cam lobe follower 41 preferably includes a roller follower that is adapted to contact the exhaust cam lobe 14 and the EGR bump 11.
- a second end of the exhaust rocker arm 40 has a lash adjuster 42.
- the lash adjuster 42 is adjacent to a crosshead 400.
- the lash adjuster 42 is described in detail below.
- the crosshead 400 is preferably a bridge device that is capable of opening two exhaust valves simultaneously.
- the exhaust rocker arm 40 also includes a control valve 43.
- the control valve 43 is in communication with a fluid passageway 44 that extends through the exhaust rocker arm 40 to the lash adjuster 42.
- the control valve 43 is also in communication with a fluid passageway 511 in common rocker shaft 50 that extends between the control valve 43 and supply passage 51 of the common rocker shaft 50.
- the fluid passageway 511 terminates at a control slot 512.
- the control valve 43 is capable of being received within the control slot 512.
- the lash adjuster 42 is located on one end of the exhaust rocker arm 40.
- the lash adjuster 42 includes a screw assembly 421 that permits manual adjustment of the lash.
- a desired lash may be set by rotating the screw assembly 421.
- a spring assembly 422 surrounds the screw assembly 421, as shown in Fig. 3.
- One end of the screw assembly 422 contacts an end of the screw assembly 421.
- An opposite end contacts a lash piston assembly 423, as shown in Fig. 3.
- a portion of the screw assembly 421 and the spring assembly 422 are received within a cavity within the piston assembly 423.
- a free end of the piston assembly 423 includes a pin 424 for contacting the crosshead 400.
- the intake rocker arm 30, as shown in Figs. 8 and 9, is rotatably mounted on the common rocker shaft 50.
- a first end of the intake rocker arm 30 includes an intake cam lobe follower 31.
- the intake cam lobe follower 31 is adapted to contact the intake cam lobe 13.
- a second end of the intake rocker arm 30 has a lash adjuster 32.
- the lash adjuster 32 has the same design as the lash adjuster 41 described above in connection with the exhaust rocker arm 40.
- the lash adjuster 32 is adjacent to a crosshead 300.
- the lash adjuster 32 is described in detail below.
- the crosshead 300 is also preferably a bridge device that is capable of opening two intake valves simultaneously.
- the intake rocker arm 30 also includes a control valve 33.
- the control valve 33 is in communication with a fluid passageway 34 that extends through the intake rocker arm 30 to the lash adjuster 32.
- the control valve 33 has the same construction as the control valve 43 described above in connection with the exhaust rocker arm 40.
- the control valve 33 is also in communication with a fluid passageway 521 that extends between the control valve 33 and supply passage 52 of the common rocker shaft 50.
- the fluid passageway 521 terminates at a control slot 522.
- the control slot 522 is not shown in the embodiment of Fig. 9.
- the control valve 33 is capable of being received within the control slot 522.
- the lash adjuster 32 has a similar construction to the lash adjuster 42, discussed above.
- the lash adjuster 32 includes a screw assembly 321 that permits manual adjustment of the lash.
- a screw assembly 322 surrounds the screw assembly 321.
- One end of the screw assembly 322 contacts an end of the screw assembly 321.
- An opposite end contacts a lash piston assembly 323.
- a portion of the screw assembly 321 and the spring assembly 322 are received within a cavity within the piston assembly 323.
- a free of the piston assembly 323 includes a pin 324 for contacting the crosshead 300.
- the braking rocker arm 20, as shown in Fig.10, is rotatably mounted on the common rocker shaft 50.
- the structure of the braking rocker arm 20 is similar to that disclosed in U.S. Patent Application Serial No. 09/165,291, entitled “Improved Rocker Brake Assembly With Hydraulic Lock,” the disclosure of which is incorporated herein by reference.
- a first end of the brake rocker arm 20 includes a brake cam lobe follower 21.
- the brake cam lobe follower 21 preferably includes a roller follower that is in contact with the brake cam lobe 12.
- a second end of the brake rocker arm 20 has an actuator piston 22.
- the actuator piston 22 is spaced from the crosshead 400 of the exhaust rocker arm 40.
- the brake rocker arm 20 When activated, the brake rocker arm 20 and the actuator piston 22 contact the crosshead 400 to open the at least one exhaust valve.
- the brake rocker arm 20 also includes a control valve 23.
- the valve 23 is in communication with a fluid passageway 24 that extends through the braking rocker arm 20 to the actuator piston 22.
- the valve 24 is also in communication with a fluid passageway 531 that extends between the valve 24 and passage 53 of the common rocker shaft 50.
- the first operating condition during positive power occurs during light loads and low engine rpm, essentially when an EGR event does not provide any benefit.
- the second operating condition during positive power occurs when an EGR event is beneficial.
- the valve assembly 510 is closed. Hydraulic fluid does not flow from the passage 51 to the exhaust rocker arm 40.
- the control valve 43 remains within the control slot 512, as shown in Figs. 4 and 5.
- the range of movement of the rocker arm 40 is limited to the size of the control slot 512.
- Hydraulic fluid is not provided to the lash adjuster 42.
- the lash adjuster 42 does not extend which reduces exhaust valve lift and delays exhaust valve timing, as shown in Fig. 1 by line C. Furthermore, the lift associated with the EGR bump 11 is absorbed so no EGR event is produced.
- the valve assembly 520 is closed. Hydraulic fluid does not flow from the passage 52 to the intake rocker arm 30.
- the control valve 33 remains within the control slot 522, as shown in Fig. 8.
- the range of movement of the rocker arm 30 is limited to the size of the control slot 522. Hydraulic fluid is not provided to the lash adjuster 32.
- the lash adjuster 32 does not extend which reduces intake valve lift and delays intake valve timing, as shown in Fig. 1 by line E.
- the valve assembly 530 is closed.
- the control valve 23 remains seated within the recess 532 of the rocker arm 50.
- the braking rocker arm 20 is disabled.
- the brake cam lobe follower 21 does not contact the braking lobe 12.
- valve assembly 510 is open. Hydraulic fluid flows from the passage 51 in the common rocker shaft 50. The presence of hydraulic fluid within fluid passageway 511 and control slot 512 causes the control valve 43 to be biased out of the control slot 512, as shown in Figs. 3 and 6.
- the range of movement of the rocker arm 40 is not limited.
- hydraulic fluid is provided to the lash adjuster 42, which extends to contact crosshead 400. All movement of the rocker arm 40 when contacting exhaust cam lobe 14 is transferred to the crosshead 400 through the lash adjuster 42. As such, there is no reduction in exhaust valve lift, as shown by line B in Fig. 1. Furthermore, there is no delay in exhaust valve timing, as shown in Fig. 1 by line B.
- the valve assembly 520 is open. Hydraulic fluid flows from the passage 52 in the common rocker shaft 50. The presence of hydraulic fluid within fluid passageway 521 and control slot 522 causes the control valve 33 to be biased out of the control slot 522.
- the range of movement of the intake rocker arm 30 is not limited. Hydraulic fluid is permitted to flow to lash adjuster 432, which extends to contact crosshead 300. All movement of the intake rocker arm 30 when contacting intake cam lobe 13 is transferred to the crosshead 300 through the lash adjuster 32. As a result, there is no reduction in intake valve lift and no delay in intake valve timing, as shown in Fig. 1 by line D.
- the operation of the braking rocker arm 20 during the second operating condition during positive power is the same as during the first operating condition.
- the braking rocker arm 20 is disabled.
- valve assemblies 510 and 520 may be independently operated and adjusted to independently vary the timing and lift of the exhaust valves and the intake valves.
- the valve assembly 510 is closed. This permits the hydraulic fluid within the passageway 44 to drain from the rocker arm 40, which causes the lash adjuster 42 to retract such that it is not in contact with crosshead 400. Hydraulic fluid does not flow from the passage 51 to the exhaust rocker arm 40.
- the control valve 43 returns to a position within the control slot 512, as shown in Figs. 3 and 6 The range of movement of the rocker arm 40 is then limited to the size of the control slot 512.
- the lash adjuster 42 again reduces exhaust valve lift and delays exhaust valve timing, as shown in Fig. 1 by line C.
- the valve assembly 520 is closed. This permits the hydraulic fluid within the passageway 34 to drain from the intake rocker arm 30, which causes the lash adjuster 32 to retract such that it is not in contact with crosshead 300. Hydraulic fluid does not flow from the passage 52 to the intake rocker arm 30.
- the control valve 33 returns to a position within the control slot 522, as shown in Fig. 8. The range of movement of the rocker arm 30 is again limited to the size of the control slot 522.
- the lash adjuster 32 does not extend which reduces intake valve lift and delays intake valve timing, as shown in Fig. 1 by line E.
- valve assembly 530 is operated. Hydraulic fluid is permitted to flow from passage 53 through passageway 531 within the rocker shaft 50.
- the control valve 23 is biased against the flow of hydraulic fluid such that hydraulic fluid flows through passageway 24 to the actuator piston 22.
- the actuator piston 22 then extends to a fully extended position such that it contacts crosshead 400.
- a hydraulic lock is formed thus holding the actuator piston 22 in an extended position.
- the operation of the exhaust valve is now partially controlled by the braking rocker arm 20 in response to actuation by the brake cam lobe 12. The operation of the exhaust valves will occur in response to the profile of the brake cam lobe 12, as shown in Fig. 1 by line A.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Valve Device For Special Equipments (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
- This application relates to and claims priority on provisional
application serial number 60/129,253 filed April 14, 1999. - The present invention relates to an apparatus for operating at least one engine valve in an engine cylinder according to the preamble of claim 1.
- Such an apparatus is known from the prior art.
EP 0 520 801 discloses a variable valve actuation control system. A pair of intake valves is operated through rocker arms and cam lobes. In order to change the lift of the rocker arm rotation during a predetermined engine operation condition, two rocker arms may be connected to a third rocker arm which is operated through a cam lobe. In order to connect the three rocker arms, pistons are provided within the rocker arms. By applying pressure through an opening in the rocker shaft and a channel in a rocker arm, the pistons can be moved. - US 5,809,952 describes a method for modifying an engine valve event. Fluid is supplied to a rocker arm which is pivotally mounted on a rocker shaft. The rotation of the rocker arm relative to the rocker shaft is varied.
- It has been published that an exhaust event with an internal hot exhaust gas recirculation ("EGR") event is beneficial in controlling emissions by directing a small amount of the exhaust gas back into the valve cylinder to mix with intake air. The combined intake and exhaust gas with the depleted oxygen helps create a lower burn temperature, which helps reduce the generation of nitrogen oxides. There are, however, certain positive power conditions.during which the EGR event does not add any benefit. These conditions include a light load and low engine rpm. The EGR event also does not provide any benefit during engine braking where the EGR event reduces braking power. Therefore, it is desirable to have the EGR event to be selectable, on as desired during positive power and off during braking.
- It is an object of the present invention to provide a device for an engine that can change the intake valve lift of an intake valve.
- It is another object of the present invention to provide a device for an engine that can change the timing of the intake valve.
- It is another object of the present invention to provide a device for an engine that can change the timing of the intake valve to improve emission and fuel economy.
- It is another object of the present invention to provide a device for an engine that can advance or retard the timing of the intake valve to improve emission and fuel economy.
- It is another object of the present invention to provide a device for an overhead cam diesel engine that can change the intake valve lift of the intake valve.
- It is another object of the present invention to provide a device for an overhead cam diesel engine that can change the timing of the intake valve.
- It is an object of the present invention to provide a device for an engine that can change the exhaust valve lift of an exhaust valve.
- It is another object of the present invention to provide a device for an engine that can change the timing of the exhaust valve.
- It is another object of the present invention to provide a device for an engine that can change the timing of the exhaust valve to improve emission and fuel economy.
- It is another object of the present invention to provide a device for an engine that can advance or retard the timing of the exhaust valve to improve emission and fuel economy.
- It is another object of the present invention to provide a device for an overhead cam diesel engine that can change the exhaust valve lift of the exhaust valve.
- It is another object of the present invention to provide a device for an overhead cam diesel engine that can change the timing of the exhaust valve.
- It is another object of the present invention to provide a device for an engine that permits the exhaust valve to operate with an EGR event when desired.
- It is another object of the present invention to provide a device for an engine that permits an EGR event during selected operating conditions during positive power.
- It is another object of the present invention to provide a device for an engine that does not permit an EGR event during engine braking.
- In order to achieve the aforementioned and other objects according to the present invention, there is provided an apparatus for operating at least one engine valve in an engine cylinder in accordance with claim 1 and a method in accordance with claim 15. Preferred embodiments are claimed in the dependent claims.
- It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only, and are not restrictive of the invention as claimed. The accompanying drawings, which are incorporated herein by reference, and which constitute a part of this specification, illustrate certain embodiments of the invention and, together with the detailed description, serve to explain the principles of the present invention.
- The present invention will now be described in connection with the following figures in which like reference numbers refer to like elements and wherein:
- Fig. 1 is a graph depicting exhaust and intake valve lift during various engine operating conditions during positive power and engine brakings;
- Fig. 2 is a top view of the arrangement of the rocker arm assemblies and the intake and exhaust valve assemblies in accordance with the present invention;
- Fig. 3 is a schematic view of the exhaust rocker arm in accordance with the present invention;
- Fig. 4 is a partial schematic view of the exhaust rocker arm of Fig. 3 with control valve in a position to preclude an EGR event;
- Fig. 5 is a partial exploded view of the exhaust rocker arm of Fig. 3 depicting the control valve positioned within a slot in the common rocker shaft during engine braking and a first positive power operating condition;
- Fig. 6 is a partial exploded view of the exhaust rocker arm of Fig. 3 depicting the control valve positioned outside the slot in the common rocker shaft during a second positive power operating condition;
- Fig. 7 is a schematic view depicting the exhaust, intake and braking valve assemblies in connection with the common rocker shaft;
- Fig. 8 is a schematic view of the intake rocker arm in accordance with the present invention;
- Fig. 9 is another schematic view of the intake rocker arm in accordance with the present invention; and
- Fig. 10 is a schematic view of the braking rocker arm in accordance with the present invention.
- Reference will now be made in detail to a preferred embodiment of the present invention, an example of which is illustrated in the accompanying drawings. Fig. 2 illustrates a top view of the present invention in an overhead cam diesel engine. An
intake rocker arm 30, anexhaust rocker arm 40 and abraking rocker arm 20 are pivotably mounted on and spaced along arocker shaft 50. Theintake rocker arm 30 is adapted to engage anintake valve crosshead 300 for at least one intake valve to operate the at least one intake valve. Theexhaust rocker arm 40 is adapted to engage anexhaust valve crosshead 400 for at least one exhaust valve to operate the at least one exhaust valve during predetermined operating conditions. Thebraking rocker arm 20 is also adapted to engage thecrosshead 400 to operate the at least one exhaust valve during an engine braking operation. - The
rocker arms common rocker shaft 50 having at least two passages formed therein. Therocker shaft 50 has apassage 51 through which a supply of controlled engine oil or other suitable hydraulic fluid flows therethrough toexhaust rocker arm 40 on demand. Avalve assembly 510 controls the flow of engine oil to theexhaust rocker arm 40. Thevalve assembly 510 is preferably a solenoid valve. It, however, is contemplated by the inventors of the present invention that other suitable valves may be substituted and are considered to be within the scope of the present invention. Thevalve assembly 510 may be located on one of therocker shaft 50, the engine or theexhaust rocker arm 40. - The
rocker shaft 50 has apassage 52 through which a supply of controlled engine oil or other suitable hydraulic fluid flows therethrough to theintake rocker arm 30. Avalve assembly 520 controls the flow of engine oil to theintake rocker arm 30. Thevalve assembly 520 is preferably a solenoid valve. It, however, is contemplated by the inventors of the present invention that other suitable valves may be substituted and are considered to be within the scope of the present invention. Thevalve assembly 520 may be located on one of therocker shaft 50, the engine or theintake rocker arm 30. - The
rocker shaft 50 has apassage 53 through which a supply of controlled engine oil or other suitable hydraulic fluid flows therethrough to brakingrocker arm 20 on demand. Avalve assembly 530 controls the flow of engine oil to thebraking rocker arm 20. Thevalve assembly 530 is preferably a solenoid valve. It, however, is contemplated by the inventors of the present invention that other suitable valves may be substituted and are considered to be within the scope of the present invention. Thevalve assembly 530 may be located on one of therocker shaft 50, the engine or thebraking rocker arm 20. - The
rocker shaft 50 has apassage 54 through which a supply of engine oil or other suitable hydraulic fluid flows therethrough to lubricate therocker arms rocker arms common rocker shaft 50. - The
rocker arms cam shaft 10 having three spacedcam lobes Exhaust cam lobe 14 corresponds to theexhaust rocker arm 40. AnEGR bump 11 also corresponds to theexhaust rocker arm 40.Intake cam lobe 13 corresponds to anintake rocker arm 30.Brake cam lobe 12 corresponds to abrake rocker arm 20. - The
exhaust rocker arm 40, as shown in Fig. 3, is rotatably mounted on thecommon rocker shaft 50. A first end of theexhaust rocker arm 40 includes an exhaustcam lobe follower 41. The exhaustcam lobe follower 41 preferably includes a roller follower that is adapted to contact theexhaust cam lobe 14 and theEGR bump 11. A second end of theexhaust rocker arm 40 has alash adjuster 42. Thelash adjuster 42 is adjacent to acrosshead 400. Thelash adjuster 42 is described in detail below. Thecrosshead 400 is preferably a bridge device that is capable of opening two exhaust valves simultaneously. Theexhaust rocker arm 40 also includes acontrol valve 43. Thecontrol valve 43 is in communication with afluid passageway 44 that extends through theexhaust rocker arm 40 to thelash adjuster 42. Thecontrol valve 43 is also in communication with afluid passageway 511 incommon rocker shaft 50 that extends between thecontrol valve 43 andsupply passage 51 of thecommon rocker shaft 50. Thefluid passageway 511 terminates at acontrol slot 512. Thecontrol valve 43 is capable of being received within thecontrol slot 512. - As discussed above, the
lash adjuster 42 is located on one end of theexhaust rocker arm 40. Thelash adjuster 42 includes ascrew assembly 421 that permits manual adjustment of the lash. A desired lash may be set by rotating thescrew assembly 421. Aspring assembly 422 surrounds thescrew assembly 421, as shown in Fig. 3. One end of thescrew assembly 422 contacts an end of thescrew assembly 421. An opposite end contacts alash piston assembly 423, as shown in Fig. 3. A portion of thescrew assembly 421 and thespring assembly 422 are received within a cavity within thepiston assembly 423. A free end of thepiston assembly 423 includes apin 424 for contacting thecrosshead 400. When thepassageway 44 is filled with hydraulic fluid, hydraulic fluid then fills the cavity in thepiston assembly 423. Thepiston assembly 423 moves downward against the bias of thespring assembly 422 such that thepin 424 contacts thecrosshead 400. It, however, is contemplated by the inventor of the present invention that other suitable lash adjusters including, but not limited to, electronically operated lash adjusters and mechanically operated adjusters may be substituted for the above described hydraulic lash adjuster. These variations and modifications are considered to be within the scope of the present invention. - The
intake rocker arm 30, as shown in Figs. 8 and 9, is rotatably mounted on thecommon rocker shaft 50. A first end of theintake rocker arm 30 includes an intakecam lobe follower 31. The intakecam lobe follower 31 is adapted to contact theintake cam lobe 13. A second end of theintake rocker arm 30 has alash adjuster 32. Thelash adjuster 32 has the same design as thelash adjuster 41 described above in connection with theexhaust rocker arm 40. Thelash adjuster 32 is adjacent to acrosshead 300. Thelash adjuster 32 is described in detail below. Thecrosshead 300 is also preferably a bridge device that is capable of opening two intake valves simultaneously. Theintake rocker arm 30 also includes acontrol valve 33. Thecontrol valve 33 is in communication with afluid passageway 34 that extends through theintake rocker arm 30 to thelash adjuster 32. Thecontrol valve 33 has the same construction as thecontrol valve 43 described above in connection with theexhaust rocker arm 40. Thecontrol valve 33 is also in communication with afluid passageway 521 that extends between thecontrol valve 33 andsupply passage 52 of thecommon rocker shaft 50. Thefluid passageway 521 terminates at acontrol slot 522. Thecontrol slot 522 is not shown in the embodiment of Fig. 9. Thecontrol valve 33 is capable of being received within thecontrol slot 522. - The
lash adjuster 32 has a similar construction to thelash adjuster 42, discussed above. Thelash adjuster 32 includes ascrew assembly 321 that permits manual adjustment of the lash. Ascrew assembly 322 surrounds thescrew assembly 321. One end of thescrew assembly 322 contacts an end of thescrew assembly 321. An opposite end contacts alash piston assembly 323. A portion of thescrew assembly 321 and thespring assembly 322 are received within a cavity within thepiston assembly 323. A free of thepiston assembly 323 includes apin 324 for contacting thecrosshead 300. When thepassageway 34 is filled with hydraulic fluid hydraulic fluid then fills the cavity in thepiston assembly 323. Thepiston assembly 323 moves downward against the bias of thespring assembly 322 such that thepin 324 contacts thecrosshead 300. It, however, is contemplated by the inventor of the present invention that other suitable lash adjusters including, but not limited to, electronically operated lash adjusters and mechanically operated adjusters may be substituted for the above described hydraulic lash adjuster. These variations and modifications are considered to be within the scope of the present invention. - The
braking rocker arm 20, as shown in Fig.10, is rotatably mounted on thecommon rocker shaft 50. The structure of thebraking rocker arm 20 is similar to that disclosed in U.S. Patent Application Serial No. 09/165,291, entitled "Improved Rocker Brake Assembly With Hydraulic Lock," the disclosure of which is incorporated herein by reference. A first end of thebrake rocker arm 20 includes a brakecam lobe follower 21. The brakecam lobe follower 21 preferably includes a roller follower that is in contact with thebrake cam lobe 12. A second end of thebrake rocker arm 20 has an actuator piston 22. The actuator piston 22 is spaced from thecrosshead 400 of theexhaust rocker arm 40. When activated, thebrake rocker arm 20 and the actuator piston 22 contact thecrosshead 400 to open the at least one exhaust valve. Thebrake rocker arm 20 also includes acontrol valve 23. Thevalve 23 is in communication with afluid passageway 24 that extends through thebraking rocker arm 20 to the actuator piston 22. Thevalve 24 is also in communication with a fluid passageway 531 that extends between thevalve 24 andpassage 53 of thecommon rocker shaft 50. - In accordance with the present invention, there are at least two engine operating conditions during the positive power engine operating mode. The first operating condition during positive power occurs during light loads and low engine rpm, essentially when an EGR event does not provide any benefit. The second operating condition during positive power occurs when an EGR event is beneficial.
- The operation of the
exhaust rocker arm 40 during the first operating condition during positive power will now be described. During the first operating condition, thevalve assembly 510 is closed. Hydraulic fluid does not flow from thepassage 51 to theexhaust rocker arm 40. Thecontrol valve 43 remains within thecontrol slot 512, as shown in Figs. 4 and 5. The range of movement of therocker arm 40 is limited to the size of thecontrol slot 512. Hydraulic fluid is not provided to thelash adjuster 42. Thelash adjuster 42 does not extend which reduces exhaust valve lift and delays exhaust valve timing, as shown in Fig. 1 by line C. Furthermore, the lift associated with theEGR bump 11 is absorbed so no EGR event is produced. - The operation of the
intake rocker arm 30 during the first operating condition during positive power will now be described. During the first operating condition, thevalve assembly 520 is closed. Hydraulic fluid does not flow from thepassage 52 to theintake rocker arm 30. Thecontrol valve 33 remains within thecontrol slot 522, as shown in Fig. 8. The range of movement of therocker arm 30 is limited to the size of thecontrol slot 522. Hydraulic fluid is not provided to thelash adjuster 32. Thelash adjuster 32 does not extend which reduces intake valve lift and delays intake valve timing, as shown in Fig. 1 by line E. - The operation of the
braking rocker arm 20 during the first operating condition during positive power will now be described. During the first operating condition, thevalve assembly 530 is closed. Thecontrol valve 23 remains seated within the recess 532 of therocker arm 50. Thebraking rocker arm 20 is disabled. The brakecam lobe follower 21 does not contact thebraking lobe 12. - The operation of the
exhaust rocker arm 40 during the second operating condition during positive power will now be described. During the second operating condition, thevalve assembly 510 is open. Hydraulic fluid flows from thepassage 51 in thecommon rocker shaft 50. The presence of hydraulic fluid withinfluid passageway 511 andcontrol slot 512 causes thecontrol valve 43 to be biased out of thecontrol slot 512, as shown in Figs. 3 and 6. The range of movement of therocker arm 40 is not limited. Furthermore, hydraulic fluid is provided to thelash adjuster 42, which extends to contactcrosshead 400. All movement of therocker arm 40 when contactingexhaust cam lobe 14 is transferred to thecrosshead 400 through thelash adjuster 42. As such, there is no reduction in exhaust valve lift, as shown by line B in Fig. 1. Furthermore, there is no delay in exhaust valve timing, as shown in Fig. 1 by line B. - The operation of the
intake rocker arm 30 during the second operating condition during positive power will now be described. During the second operating condition, thevalve assembly 520 is open. Hydraulic fluid flows from thepassage 52 in thecommon rocker shaft 50. The presence of hydraulic fluid withinfluid passageway 521 andcontrol slot 522 causes thecontrol valve 33 to be biased out of thecontrol slot 522. The range of movement of theintake rocker arm 30 is not limited. Hydraulic fluid is permitted to flow to lash adjuster 432, which extends to contactcrosshead 300. All movement of theintake rocker arm 30 when contactingintake cam lobe 13 is transferred to thecrosshead 300 through thelash adjuster 32. As a result, there is no reduction in intake valve lift and no delay in intake valve timing, as shown in Fig. 1 by line D. - The operation of the
braking rocker arm 20 during the second operating condition during positive power is the same as during the first operating condition. Thebraking rocker arm 20 is disabled. - It is contemplated by the inventor of the present invention that the
valve assemblies - The operation of the
exhaust rocker arm 40 will now be described during an engine braking operation. During engine braking, thevalve assembly 510 is closed. This permits the hydraulic fluid within thepassageway 44 to drain from therocker arm 40, which causes thelash adjuster 42 to retract such that it is not in contact withcrosshead 400. Hydraulic fluid does not flow from thepassage 51 to theexhaust rocker arm 40. Thecontrol valve 43 returns to a position within thecontrol slot 512, as shown in Figs. 3 and 6 The range of movement of therocker arm 40 is then limited to the size of thecontrol slot 512. Thelash adjuster 42 again reduces exhaust valve lift and delays exhaust valve timing, as shown in Fig. 1 by line C. Furthermore, the lift associated with theEGR bump 11 is absorbed so no EGR event is produced. The operation of theintake rocker arm 30 during the engine braking will now be described. Thevalve assembly 520 is closed. This permits the hydraulic fluid within thepassageway 34 to drain from theintake rocker arm 30, which causes thelash adjuster 32 to retract such that it is not in contact withcrosshead 300. Hydraulic fluid does not flow from thepassage 52 to theintake rocker arm 30. Thecontrol valve 33 returns to a position within thecontrol slot 522, as shown in Fig. 8. The range of movement of therocker arm 30 is again limited to the size of thecontrol slot 522. Thelash adjuster 32 does not extend which reduces intake valve lift and delays intake valve timing, as shown in Fig. 1 by line E. - The operation of the
braking rocker arm 20 during an engine braking operation will now be described. During engine braking, thevalve assembly 530 is operated. Hydraulic fluid is permitted to flow frompassage 53 through passageway 531 within therocker shaft 50. Thecontrol valve 23 is biased against the flow of hydraulic fluid such that hydraulic fluid flows throughpassageway 24 to the actuator piston 22. The actuator piston 22 then extends to a fully extended position such that it contacts crosshead 400. When thepassageway 24 is filled with hydraulic fluid and the pressure is equalized withinvalve 23, a hydraulic lock is formed thus holding the actuator piston 22 in an extended position. The operation of the exhaust valve is now partially controlled by the brakingrocker arm 20 in response to actuation by thebrake cam lobe 12. The operation of the exhaust valves will occur in response to the profile of thebrake cam lobe 12, as shown in Fig. 1 by line A. - It will be apparent to those skilled in the arts that various modifications and variations can be made in the construction and configuration of the present invention, without departing from the scope or spirit of the invention. For example, the braking
rocker arm 20 may be eliminated. Engine braking can occur using conventional methods. Several variations have been discussed in the preceding text. Furthermore, it is contemplated that the present invention may be used with a common rail camless type engine whereby the above described rocker arms may be electronically operated. Others will be apparent to persons of ordinary skills in the art. It is intended that the present invention cover the modifications and variations of the invention, provided they come within the scope of the appended claims and their equivalence.
Claims (16)
- An apparatus for operating at least one engine valve in an engine cylinder, said apparatus comprising:a rocker arm (20,30,40) pivotally mounted on a rocker shaft (50) for operating the at least one engine valve;a valve train assembly in selective contact with said rocker arm (20,30,40) for rotating said rocker arm (20,30,40) through a rotation range about the rocker shaft (50) and said valve train assembly is a cam (12,13,14),characterised by
means for engaging the rocker shaft (50) to vary the range of rocker arm rotation during a predetermined engine operating condition - The apparatus according to claim 1, wherein said engaging means comprises:a control slot (512,522) formed in the rocker shaft (50); anda releasable assembly (23,33) housed in a bore formed in said rocker arm (20,30,40) for selectively releasably engaging said control slot (512,522).
- The apparatus according to claim 2, wherein said engaging means modifies the timing of the opening of the at least one engine valve during the predetermined engine operating condition when said releasable assembly is received within said control slot (512,522).
- The apparatus according to claim 3, wherein the predetermined engine operating condition is at least one of a first positive power operating condition, a second positive power operating condition and an engine braking condition.
- The apparatus according to claim 2, wherein said engaging means modifies the lift of the at least one engine valve during the predetermined engine operating condition when said releasable assembly is received within said control slot (512,522).
- The apparatus according to claim 5, wherein said predetermined engine operating condition is at least one of a first positive power operating condition, a second positive power operating condition and an engine braking condition.
- The apparatus of claim 2, wherein said engaging means further comprises:supply means for selectively supplying hydraulic fluid to said rocker arm (20,30,40); anda hydraulic circuit formed in said rocker arm for receiving the hydraulic fluid from said supply means and providing the hydraulic fluid to said releasable assembly.
- The apparatus of claim 2, wherein said releasable assembly is a control valve (23,33).
- The apparatus of claim 2, wherein the range of rocker arm (20,30,40) rotation is limited by the size of said control slot (512,522).
- The apparatus of claim 2, wherein said releasable assembly (23,33) selectively limits the contact between said rocker arm (20,30,40) and said valve train (12,13,14) assembly.
- The apparatus of claim 2, wherein said predetermined engine condition is a low RPM positive power engine operating condition, and wherein said releasable assembly (23,33) modifies an exhaust gas recirculation event when said releasable assembly is received within said control slot (512,522).
- The apparatus of claim 2, wherein said engaging means further comprises a lash adjuster (32,42) housed in a bore formed in said rocker arm (20,30,40), wherein said releasable assembly (23,33) modifies the operation of said lash adjuster (32,42) assembly when said releasable assembly is located within said control slot (512,522).
- The apparatus according to claim 1, wherein said at least one engine valve is at least one exhaust valve.
- The apparatus according to claim 1, wherein said at least one engine valve is at least one intake valve.
- A method for selectively modifying an engine valve event during a predetermined engine operating condition, said method comprising the steps of:selectively supplying hydraulic fluid to a rocker arm (20,30,40) pivotally mounted on a rocker shaft (50);providing a valve train assembly (12,13,14) in selective contact with said rocker arm (20,30,40) for rotating said rocker arm through a rotation range about the rocker shaft (50) wherein said valve train assembly is a cam (12,13,14),characterised by
engaging the rocker shaft (50) to vary a rotation range of the rocker arm (20,30,40) on the rocker shaft (50) responsive to the supply of the hydraulic fluid to the rocker arm (20,30,40) to thereby modify the engine valve event. - The method of claim 15, wherein the engine valve event is an exhaust gas recirculation event and wherein the predetermined engine operating condition is at least one of a first positive power operating condition, a second positive power operating condition and an engine braking condition.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12925399P | 1999-04-14 | 1999-04-14 | |
US129253P | 1999-04-14 | ||
PCT/US2000/009768 WO2000061930A1 (en) | 1999-04-14 | 2000-04-13 | Exhaust and intake rocker arm assemblies for modifying valve lift and timing during positive power |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1169558A1 EP1169558A1 (en) | 2002-01-09 |
EP1169558A4 EP1169558A4 (en) | 2002-07-10 |
EP1169558B1 true EP1169558B1 (en) | 2006-06-21 |
Family
ID=22439125
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00920242A Expired - Lifetime EP1169558B1 (en) | 1999-04-14 | 2000-04-13 | Exhaust and intake rocker arm assemblies for modifying valve lift and timing during positive power |
Country Status (5)
Country | Link |
---|---|
US (1) | US6354254B1 (en) |
EP (1) | EP1169558B1 (en) |
JP (1) | JP2002541382A (en) |
DE (1) | DE60028951T2 (en) |
WO (1) | WO2000061930A1 (en) |
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-
2000
- 2000-04-13 US US09/549,028 patent/US6354254B1/en not_active Expired - Lifetime
- 2000-04-13 EP EP00920242A patent/EP1169558B1/en not_active Expired - Lifetime
- 2000-04-13 DE DE60028951T patent/DE60028951T2/en not_active Expired - Lifetime
- 2000-04-13 JP JP2000610960A patent/JP2002541382A/en active Pending
- 2000-04-13 WO PCT/US2000/009768 patent/WO2000061930A1/en active IP Right Grant
Also Published As
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JP2002541382A (en) | 2002-12-03 |
DE60028951T2 (en) | 2006-10-12 |
US6354254B1 (en) | 2002-03-12 |
WO2000061930A1 (en) | 2000-10-19 |
DE60028951D1 (en) | 2006-08-03 |
EP1169558A4 (en) | 2002-07-10 |
EP1169558A1 (en) | 2002-01-09 |
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